I've found for a red laser powered by around 4-5v, the ideal resistance range is about 5 to 20 ohms, with the larger ohm value producing the minimum mA power and the smaller value setting the maximum mA power. So a good combination would be a 10 ohm multiturn with a 5-10 ohm resistor in series.
Also, mega kudos to rog8811 for all his classy art work
Also, mega kudos to rog8811 for all his classy art work